My understand is, yes. They just broadcast the message on all towers in an area. The pager may be a simple one-way passive device. Or, it might have just enough broadcast ability to periodically ping a cell tower.
Pagers still have some specialized use cases. One of these is hospitals. A lot of hospitals still use them. Hospitals, as structures, are designed to the most strictest structural codes of any kind of building. If an earthquake or hurricane happens, you want your hospital to be the LAST building that ever falls over. So hospitals tend to be big, heavy structures that are massively over reinforced, way beyond what commercial or residential buildings would be. If you look at hospitals, they just look different as buildings. They’re hulking leviathans of structures.
While this makes them damn-near indestructible, it also can make it really difficult to get cell signals inside of them. Cell companies don’t like wasting power broadcasting signals strong enough to penetrate bunkers. They size their towers so their signals can penetrate most common buildings.
But “penetrate” is a complex term. If you only need to transmit a simple message, a lower-quality signal is often fine. Think of the difference between talking and shouting. In a noisy environment with lots of interference, we automatically switch to a form of verbal communication, shouting, that can overcome a lot of noise, but has a low information density. You can shout to be heard over a din, but you’re not going to be able to communicate subtle emotional context by minute tones in your voice.
Alternately, you can think of it that a simple message can easily be repeated many times. Want to make sure a simple text message gets through? Broadcast that thing 10,000 times in a row. That 10,000 times will still represent a fraction of a second of the data volume needed for a video call. But the pager can piece together the message from the few hundred fragments of messages that manage to get through.
I’m sure the actual network protocols are complicated, but I’m just talking about general communication here. The key is that for many reasons, you can often trade communications reliability for communications complexity. A video call will only work in perfect conditions. A simple page will penetrate thick concrete walls and work in the worst of weather events.
Oh, and often hospitals will actually install their own pager repeaters or independent pager systems right on site. In that case, the network doesn’t need to worry at all about figuring out what tower to send the signal to.
I mean, what exactly do you want? OP specifically asked how people actually go about hiring a hitman. I assume OP is not a mobster. Unless you have those kind of connections, there is zero chance you’re going to find some person you don’t already know who will be willing to kill for you in exchange for money. OP specifically asked about hiring a hitman. And that fundamentally implies that there are people out there that offer this kind of service that you can just purchase if you have the cash. And the truth is that no, that business fundamentally just does not exist. Just because some people in certain very specific contexts have killed another person for money does not mean that there is a way for the average person to find a killer-for-hire. That simply isn’t a service that you can go out and buy.